Hydraulic air jet



Nov. 21, 1933. J p. CARTER r AL 1,936,246

HYDRAULIC AIR JET Filed Oct. 9. 1931 ATTORNEYS.

Patented Nov. 21,1933

HYDRAULIC AIR JET James P. Carter and George R. McAlpine, Oklahoma City,Okla.

Application October 9,1931. SerialkNo. 567,912 H "6 Claims. (01. seeos)a Our invention relates'to jets, and more par ticularly to an air jetoperated by flowing liquid.

-In fighting'a fire within the basement, or in an inclosed place withinthe building, the confined smoke and gases, together with the heat, makeit'extremely'dangerous, and usually practically impossible for firemento enter such places in order to reach thaseat of the fire with a streamof water. Consequently, the usual methodof fighting a basement fire isto play a number of streams of waterinto the basenient from the outside,in an attempt to literally drown everything in the basement, includingthe fire. The

jwaterupon the seat of "the fire "where it would do the most good. Theresult would be the elimi- 1 nation of much d'angerto the firemen andthe preventionof much loss of property. I

The objects of our invention are to provide .a hydraulic air jet whichis new, novel, practical and of utility; which is operated by attachmentto a usual fire hose; which will quickly and efiiciently'withdraw heatedgases and smoke from basements and other inclosures; which will be willhave no movingparts tobecome worn or get out of order; which will bestrong and durable;

and, which will be eflicient in accomplishing all iiof the purposes forwhich it intended.

With these and other objects in view as will more fully appear, ourinvention consists in the construction, novel features, and combinationof parts, hereinafter more fully described, pointed 'out in the claimshereto appended, and illustrated in the accompanying one sheet drawing,of which,

Figure 1 is a longitudinal sectional view of the device;

Fig. 2 is an end elevation of the discharge end 'Jof the device, and,

Fig. 3 is an elevational view of the intake end of the device. 7

Like characters of reference designate like parts in the drawings andfigures.

It is understood that various changes in the form, proportion, size,shape, Weight, and other details of the construction, withinthe scope ofour invention, may be resorted to without departing from the spirit orbroad principle of our invention and without sacrificing any of theadvantages thereof; and it is also understood that the drawing is-to beinterpreted as being illustrative and not restrictive.

One practical embodiment of our invention, as illustrated inthedrawing,compri'ses: i I I A hollow cylindrical metal housing or Venturitube 1 having an intake end 2 and a discharge. end 3, both or either ofwhich are-adapted tobe connected by any usual means, such as fiangesi toa pipe or pipes 5. Within said housing 1 is pro-. vided a hollow falsewall 6 which at its outer ends is made integral with or is welded to theinner. wall surface of the housing, and the bore of which is reducedin'diameter'at substantially its -mid-" section, asbest seen in Fig.land as is. indicated by the reference numeral 7'. I

.A preferred degree pipe bend 8 passes laterally through the wall ofsaid housing 1 and through said false wall 6 and its inner end 9terininatesin axial alinement with the bore of said false wall 6 at thepoint 7 at which said bore is the smallest in diameter. Atthe pointswhere said bend 8 passes through the housing and through the false'wall,it is rigidly andhermetically welded in position. The inner or"discharge end 9 of said bend 8 is rigidly held in position by beingWelded to the inner ends of a plurality of webs 10 the outer ends ofwhich are made integral with or are rigidly welded to the inner the end9 of said bend 8 and is held in spaced relation with the end 9 by aplurality of webs 13 which are rigidly positioned by welding, or thelike, within said end 9.

In operation, the pipe 5 which is connected to the intake end 2 of thehousing 1 will be extended into the basement, preferably through a holecut in the floor above, and sacks or other packing will be placed aroundit so that no substantial amount of air can enter the basement throughthe cut hole. A fire hose will then be attached to the coupling 11, andthe water under high pressure will be turned on. The water inleaving theend 9 of said bend 8 will strike against the baffle l2 and be divertedto the inner surface of the false wall 6 at a point adjacent saiddischarge end 3 of the housing, as illustrated by the dotted lines andarrows in Fig. 1. There will be a substantially conical sheet of watertraveling from said baflie 12 to the point where the major portion ofthe water strikes said false wall 6. This traveling conical sheet ofwater will cause air, heated gases and smoke to be drawn into the intakeend 2, and the air, gases and smoke will be discharged through theoutlet end 3 with the water.

If found desirable, inorder to decrease the resistance to the movingsmoke and gases, that portion of said bend 8 which lies within saidfalse wall 6 nearest said intake end 2, may be bevelled to a knife edge14.

Due to the fact that water is substantially eight hundred times as heavyas air, it may be understood that if the conical sheet of water istraveling at a high velocity, a tremendous suction will be exertedthrough said intake end 2, and that a large volume of the smoke andgases can be handled through our device in a short period of time.

Obviously, the invention is susceptible of embodiment in forms otherthan that which is illustrated in the accompanying drawing and describedherein, and applicable for uses and purposes other than as detailed, andwe therefore consider as our own all such modifications and adaptationsand other uses of the form of the device herein described as fairly fallwithin the scope of our invention.

Having thus described our invention, what is claimed and desired to besecured by Letters Patent, is: r

1. A hydraulic air jet, embodying a hollow duct having a bore restrictedin diameter at a substantially medial point, said bore gradually slopingaway from the stricture toward the ends of the duct to a greaterdiameter, a liquid conveying pipe having its outlet end axiallypositioned within the stricturein spaced relation to the walls thereof,and a baflie adjacent the outlet orifice of said pipe for directing theliquid toward the sloping inner wall of the duct.

2. A hydraulic air jet, embodying a hollow duct having a bore restrictedin diameter at a substantially medial point, said bore gradually slopingaway from the stricture toward the ends of the duct to a greaterdiameter, a liquid conveying pipe having its outlet end axiallypositioned within the stricture in spaced relation to the walls thereof,and a conical baffle adjacent the outlet orifice of said pipe fordirecting the liquid to the sloping inner wall of the duct.

3. A hydraulic air jet, embodying a hollow duct having a bore restrictedin diameter at a substantially medial point, said bore gradually slopingaway from the stricture toward the ends of the duct to a greaterdiameter, a liquid conveying pipe having its outlet end axiallypositioned within the stricture in spaced relation to the walls thereof,and a baflle adjacent the outlet orifice of said pipe for directing theliquid toward a point on the wall of the bore adjacent the outlet end ofthe duct.

4. A hydraulic air jet, embodying a hollow duct having a bore restrictedat a point intermediate its ends, said bore being gradually enlargedfrom the stricture to the ends of the duct, a liquid conveying pipe,means carried by the inner walls of the duct for rigidly positioning theoutlet end of said pipe axially in said stricture in spaced relation tothe walls of the duct, a conical bafiie adjacent the outlet orifice ofsaid pipe for directing the liquid in a conical sheet toward a point onthe wall of the bore adjacent the outlet end of the duct, and means forholding said baffie in spaced relation to the outlet end of said pipe.

5. A hydraulic air jet, embodying a hollow duct having a bore restrictedat a point intermediate its ends, said bore being gradually enlargedfrom the stricture to the ends of the duct, a liquid conveying pipehaving its inlet end exterior to and its outlet end within said duct,means carried by the inner walls of the duct for rigidly positioning theoutlet end of said pipe axially in said stricture in spaced relation tothe Walls of the duct, a bafiie adjacent the outlet orificeof said pipefor directing the liquid toward a point on the wall of the bore adjacentthe outlet end of the duct, and means for holding said baffle in spacedrelation to the outlet end of said pipe.

6. In a hydraulic air jet, a liquid pressure line, a Venturi tubeconcentrically surrounding the discharge end of the line, the reducedportion of said tube located adjacent said discharge end, and a baffleadjacent said discharge end for deflecting liquid from the discharge endof the line to the walls of the tube in a conical sheet. 7

JAMES P. CARTER. GEORGE R. MCALPINE. 1

